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Convert Central Time to Iran Time

CST · UTC−6 → IRST · UTC+3:30

CST is 9 hours 30 minutes behind IRST

Today Chicago is on CDT (UTC−5) and Tehran on UTC+3:30 (UTC+3:30), so right now Chicago is 8 hours 30 minutes behind Tehran.

Chicago · CDT

Wednesday, 7 October 2026

Tehran · UTC+3:30

Wednesday, 7 October 2026

When are both sides at work?

0003060912151821
ChicagoCDT · -05:00
0003060912151821
TehranUTC+3:30 · +03:30
0811141720230205

Shared working hours: 09:00–09:30 in Chicago is 17:30–18:00 in Tehran.

Working (09–18) Awake, off the clock Asleep (23–07)

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06:27 Wed 7 Oct Chicago = 14:57 Wed 7 Oct Tehran

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Hour-by-hour conversion

Chicago (CST)Tehran (IRST)
00:0008:30
01:0009:30
02:0010:30
03:0011:30
04:0012:30
05:0013:30
06:0014:30Now
07:0015:30
08:0016:30
09:0017:30Both at work
10:0018:30
11:0019:30
12:0020:30
13:0021:30
14:0022:30
15:0023:30
16:0000:30next day
17:0001:30next day
18:0002:30next day
19:0003:30next day
20:0004:30next day
21:0005:30next day
22:0006:30next day
23:0007:30next day

About this conversion

CST here means Central Time, represented by Chicago (America/Chicago), currently UTC−5. IRST means Iran Time, represented by Tehran (Asia/Tehran), currently UTC+3:30.

CST is used by 15 zones, including United States. If you meant a different one, see every meaning of CST.

Working hours are shown as 09:00–18:00 local, and sleeping hours as 23:00–07:00. The hour table is anchored on the current day in Chicago; day boundaries are marked where the date differs.

Quick answers

  • 09:00 CST is 17:30 IRST
  • 12:00 CST is 20:30 IRST
  • 15:00 CST is 23:30 IRST
  • 18:00 CST is 02:30 IRST

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